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If f(x)=((x+1)^(7)sqrt(1+x^(2)))/((x^(2)...

If `f(x)=((x+1)^(7)sqrt(1+x^(2)))/((x^(2)-x+1)^(6))` then the valueof `f'(0)` is equal to:

A

`10`

B

`11`

C

`13`

D

`15`

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